基于分形理论的高速铁路高架桥接触网系统雷击空间电场研究  

Study on Space Electric Field of Lightning Strike to HSR Viaduct Catenary System Based on Fractal Theory

作　　者：李瑞芳[1] 陈力生 陈奎[1] 曹晓斌[1] 孙晓东 徐超 LI Ruifang;CHEN Lisheng;CHEN Kui;CAO Xiaobin;SUN Xiaodong;XU Chao(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China;Chengdu Metro Operation Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]西南交通大学电气工程学院,四川成都610031 [2]成都地铁运营有限公司,四川成都610031

出　　处：《铁道学报》2018年第9期57-64,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(51507145)

摘　　要：雷击高速铁路高架桥接触网系统的空间电场研究是高速铁路防雷研究的基础。本文采用有限差分法和超松弛迭代法计算雷击高速铁路高架桥接触网系统的空间电场,结合雷电先导分形发展的统计特性和跃变判据确定出相应的模型参数,建立并验证了雷击高速铁路高架桥接触网系统的雷电先导分形模型。通过该模型的仿真,得到接触线和AF线有无工作电压、不同高架桥高度和不同雷电流幅值3种情况下的雷电跃变前一瞬间的空间电场。分析结果得出:接触线和AF线的工作电压、高架桥高度和雷电流幅值均会影响该空间电场的分布,雷电流幅值还会影响该空间电场的数量级大小。The study on space electric field of lightning strike to HSR viaduct catenary system is the foundation of the lightning protection research for high-speed railway.In this paper,the finite difference method and successive over-relaxation iteration method were employed to calculate the space electric field.A fractal model of lightning leader related to HSR viaduct catenary system was established and verified,combined with statistic property of fractal propagating leader and final jump criteria,as the associated parameters of this model were determined.According to the simulation using this model,the space electric field at the moment immediately before lightning final jump was achieved in the three cases of catenary and AF lines with or without working voltage,various heights of the viaduct and various amplitudes of the lightning current.The analysis results show that the working voltage of catenary and AF lines,the height of the viaduct,and the amplitude of the lightning current all affect the distribution of the space electric field and the value magnitude of the field could also be affected by the amplitude of lightning current.

关 键 词：雷电先导分形模型 有限差分法 超松弛迭代法 空间电场 影响因素 

分 类 号：U229[交通运输工程—道路与铁道工程]